JP6299580B2 - Nematic liquid crystal composition and liquid crystal display device using the same - Google Patents

Description

  The present invention relates to a nematic liquid crystal composition having a negative dielectric anisotropy (Δε) useful as a liquid crystal display material, and a liquid crystal display device using the same.

  Liquid crystal display elements are used in various electric appliances for home use, measuring instruments, automobile panels, word processors, electronic notebooks, printers, computers, televisions, etc., including watches and calculators. Typical liquid crystal display methods include TN (twisted nematic), STN (super twisted nematic), DS (dynamic light scattering), GH (guest / host), and IPS (in-plane switching). Type, OCB (optical compensation birefringence) type, ECB (voltage controlled birefringence) type, VA (vertical alignment) type, CSH (color super homeotropic) type, FLC (ferroelectric liquid crystal), etc. . Examples of the driving method include static driving, multiplex driving, simple matrix method, active matrix (AM) method driven by TFT (thin film transistor), TFD (thin film diode), and the like.

  Among these display methods, the IPS type, ECB type, VA type, CSH type, and the like have a feature that a liquid crystal material having a negative value of Δε is used. Among these, the VA type display method by AM driving is used for a display element that requires a high speed and a wide viewing angle, such as a television.

A nematic liquid crystal composition used for a display method such as a VA type is required to have a low voltage drive, a high-speed response, and a wide operating temperature range. That is, Δε is negative, the absolute value is large, the viscosity is low, and a high nematic phase-isotropic liquid phase transition temperature (T _ni ) is required. Further, from the setting of Δn × d, which is the product of refractive index anisotropy (Δn) and cell gap (d), it is necessary to adjust Δn of the liquid crystal material to an appropriate range according to the cell gap. In addition, when applying a liquid crystal display element to a television or the like, since high-speed response is important, a liquid crystal material having a low viscosity (η) is required.

  Until now, characteristics of liquid crystal compositions have been improved by variously examining compounds having a negative Δε and a large absolute value.

  As a liquid crystal material having a negative Δε, a liquid crystal composition using the following liquid crystal compounds (A) and (B) having a 2,3-difluorophenylene skeleton (see Patent Document 1) is disclosed.

  In this liquid crystal composition, liquid crystal compounds (C) and (D) are used as compounds having Δε of approximately 0. However, this liquid crystal composition is used in a liquid crystal composition that requires a high-speed response such as a liquid crystal television. A sufficiently low viscosity has not been achieved.

  On the other hand, although a liquid crystal composition using a compound represented by the formula (E) has already been disclosed, a liquid crystal composition having a small Δn combined with the liquid crystal compound (D) (see Patent Document 2) and a response speed. Is a liquid crystal composition to which a compound having an alkenyl group in the molecule (alkenyl compound) such as liquid crystal compound (F) is added (see Patent Document 3), and achieves both high Δn and high reliability. Needed further study.

  A liquid crystal composition using a compound represented by the formula (G) has already been disclosed (see Patent Document 4), but this liquid crystal composition also contains an alkenyl compound as in the above liquid crystal compound (F). Since it is a liquid crystal composition containing a compound, there is a problem that display defects such as image sticking and display unevenness are likely to occur.

  In addition, the influence on the display defect of the liquid crystal composition containing the alkenyl compound has already been disclosed (see Patent Document 5), but generally, the η of the liquid crystal composition increases as the content of the alkenyl compound decreases. Since it is difficult to achieve a high-speed response, it is difficult to achieve both suppression of display defects and high-speed response.

Thus, only by combining a compound in which Δε has a negative value and the liquid crystal compounds (C), (D), and (F), ΔΔ is compatible with high Δn and low η, and there is no display defect or suppressed Δε. However, it was difficult to develop a negative liquid crystal composition.
Further, a liquid crystal composition (see Patent Document 6) in which Formula (A) and Formula (G) are combined with Formula (III-F31) in which Δε is substantially zero is disclosed. However, in the manufacturing process of the liquid crystal display element, it was thought that a compound having a low vapor pressure volatilizes at a very low pressure when the liquid crystal composition is injected into the liquid crystal cell, and thus the content cannot be increased. . For this reason, the liquid crystal composition has a limited content of the formula (III-F31) and has a problem that the viscosity is remarkably high although it exhibits a large Δn.

  Further, Patent Documents 6 and 7 have already disclosed liquid crystal compositions using a compound having a fluorine-substituted terphenyl structure.

  Patent Document 8 discloses that the response speed of a homeotropic liquid crystal cell is improved by using a liquid crystal material having a large index represented by (Equation 1), but this is not sufficient. .

From the above, in a liquid crystal composition that requires a high-speed response such as a liquid crystal television, without reducing the refractive index anisotropy (Δn) and nematic phase-isotropic liquid phase transition temperature (T _ni ), It has been demanded that the viscosity (η) is sufficiently small, the rotational viscosity (γ1) is sufficiently small, and the elastic constant (K ₃₃ ) is large.

JP-A-8-104869 European Patent Application No. 0474402 JP 2006-37054 A JP 2001-354967 A JP 2008-144135 A WO2007 / 077872 JP 2003-327965 A JP 2006-301643 A

The problem to be solved by the present invention is that the viscosity (η) is sufficiently small without reducing the refractive index anisotropy (Δn) and the nematic phase-isotropic liquid phase transition temperature (T _ni ), and the rotational viscosity A liquid crystal composition having a negative dielectric anisotropy (Δε) having a sufficiently small (γ1), a large elastic constant (K ₃₃ ), and a large absolute value is provided. It is an object of the present invention to provide a liquid crystal display element which is excellent in display quality and has a high response speed, which is free from defects or suppressed.

  The present inventors have studied various biphenyl derivatives and fluorobenzene derivatives, and found that the above-mentioned problems can be solved by combining specific compounds, and have completed the present invention.

  The liquid crystal composition of the present invention has the general formula (I) as the first component.

In the formula, q represents 0 or 1, and R ⁵⁵ represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms. And a liquid crystal composition containing a compound having a content of 3 to 25% by mass and having a negative dielectric anisotropy (Δε) and an absolute value larger than 3 as a second component, In addition, a liquid crystal display element using the same is provided.

The liquid crystal composition of the present invention has a sufficiently small viscosity (η) and a rotational viscosity (γ1) without lowering the refractive index anisotropy (Δn) and the nematic phase-isotropic liquid phase transition temperature (T _ni ). ) Is sufficiently small, the elastic constant (K ₃₃ ) is large, and the absolute value has a large negative dielectric anisotropy (Δε). Therefore, a VA-type liquid crystal display element using this has no display defect or Suppressed, excellent display quality and fast response speed.

  The liquid crystal composition of the present invention contains 3 to 25% by mass of the compound represented by the general formula (I) as the first component, more preferably 5 to 20% by mass, and 5 to 15% by mass. It is particularly preferred that More specifically, the content is preferably 10 to 25% by mass for obtaining high Δn, but the content is preferably 3 to 15% by mass when emphasis is placed on suppression of precipitation at low temperatures.

R ⁵⁵ in the general formula (I) represents an alkyl group having 1 to 10 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and is an alkyl group having 2 to 5 carbon atoms or 2 to 5 carbon atoms. The alkenyl group is more preferable.

Q in the general formula (I) represents 0 or 1.
Specifically, the compound of the general formula (I) has the formula (I-A1), formula (I-A2), formula (I-A3), formula (I-A4), formula (I-A5), formula (I -B1), formula (I-B2), formula (I-B3), formula (I-B4), (I-B5) or formula (I-B6)

In the case where importance is attached to the viscosity, the formula (I-A1), the formula (I-A5), the formula (I-B1) or the formula (I-B6) is preferable, and the elastic constant is considered important. In this case, the formula (I-A4), the formula (I-B4) or the formula (I-B5) is particularly preferable.
The liquid crystal composition of the present invention preferably contains two or more compounds of the general formula (I), in which case the formula (I-A4), formula (I-B4) or formula (I-B5) It is more preferable to contain two or more at the same time.

  As the second component, Δε is negative and contains one or more compounds having an absolute value greater than 3, but the content is preferably 10 to 90% by mass, and 20 to 80% by mass. Further preferred is 30 to 70% by weight.

  Specifically, the second component is represented by the general formula (II)

Wherein R ¹ and R ² are each independently an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or 2 carbon atoms. represents 10 alkenyloxy group, ^{R 1} and ^R present in the ² one -CH ₂ - or nonadjacent two or more -CH ₂ - are each independently -O- and / or -S And one or two or more hydrogen atoms present in R ¹ and R ² may be independently substituted with a fluorine atom or a chlorine atom. Are independently trans-1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5- Difluoro-1,4-phenylene group, 2 , 3-difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6 -Represents a diyl group, a decahydronaphthalene-2,6-diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, p represents 0, 1 or 2. Z represents a- _{OCH 2 -, - CH 2 O} -, - CF 2 O -, - OCF 2 -, - CH 2 CH 2 -, - CF 2 CF 2 - it or a compound represented by the representative) a single bond. preferable.

R ¹ and R ² in the formula are each independently a linear alkyl group having 1 to 5 carbon atoms, an alkoxyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or a carbon atom More preferably, it is an alkenyloxy group having 2 to 5 carbon atoms, R ¹ is an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R ² is an alkoxyl group having 1 to 5 carbon atoms. It is particularly preferred that

  Ring A and ring B in the formula are each independently a trans-1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4. -Phenylene group, 3,5-difluoro-1,4-phenylene group or 2,3-difluoro-1,4-phenylene group is more preferable, and trans-1,4-cyclohexylene group or 1,4 A phenylene group is particularly preferred.

  More preferably, p in the formula is independently 0 or 1.

Z in the _formula, -CH 2 O -, - yet more preferably _CF 2 O-or a single bond, particularly preferably _-CH 2 O-or a single bond.

  Although the liquid-crystal composition of this invention contains 1 type, or 2 or more types of 2nd components, it is preferable to contain 2 to 10 types.

  The compounds represented by the general formula (II) are represented by the general formula (II-A1) to the general formula (II-A5) and the general formula (II-B1) to the general formula (II-B5).

(In the formula, R ³ and R ⁴ each independently represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and one or two present in R ³ and R ⁴ ) It is preferable that the hydrogen atom is a compound selected from the group consisting of general formulas (II-A1) to (II-A5). Are more preferable, and a compound of the general formula (II-A1) or the general formula (II-A3) is particularly preferable.

  The liquid crystal composition of the present invention has, as a third component, a general formula (III-A) to a general formula (III-J)

(Wherein R ⁵ is an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, R ⁶ is an alkyl group having 1 to 5 carbon atoms, and an alkoxyl having 1 to 5 carbon atoms. A group, an alkenyl group having 2 to 5 carbon atoms, or an alkenyloxy group having 2 to 5 carbon atoms) is preferably contained. However, the compound represented by the general formula (III-F) does not include the same compound as the compound represented by the general formula (I).
The third component is more preferably a compound selected from general formulas (III-A), (III-D), (III-F), (III-G) and (III-H). In the compound represented by the general formula (III-A), R ⁵ is an alkenyl group having 2 to 5 carbon atoms, R ⁶ is an alkyl group having 1 to 5 carbon atoms, or an alkyl group having 2 to 5 carbon atoms. An alkenyl group is preferred.

  As a further component, it is preferable to contain one or more compounds represented by formula (V).

In the formula, R ²¹ and R ²² are each independently an alkyl group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkyl group having 2 to 8 carbon atoms. Although an alkenyloxyl group is represented, an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms is preferable.

  The liquid crystal composition of the present invention preferably contains the compounds of general formula (I), general formula (II-A1) and general formula (III-A) at the same time. It is preferable to contain the compound of A3) and general formula (III-A) simultaneously, and it is preferable to contain the compound of general formula (I), general formula (II-B1), and general formula (III-A) simultaneously. It is preferable that the compounds of the formula (I), the general formula (II-B2) and the general formula (III-A) are simultaneously contained, and the formula (I), the general formula (II-B3) and the general formula (III-A) The compound of formula (I), the general formula (II-B4), and the compound of the general formula (III-A) are preferably contained at the same time.

  The liquid crystal composition of the present invention further preferably contains compounds of general formula (I), general formula (II-A1), general formula (II-A3) and general formula (III-A) at the same time. More preferably, the compounds of formula (I), general formula (II-B1), general formula (II-B2) and general formula (III-A) are simultaneously contained. ), A compound of the general formula (II-B3) and a compound of the general formula (III-A) is more preferable, and the compounds of the general formula (I), general formula (II-B1), general formula (II-B4) and More preferably, the compound of general formula (III-A) is contained at the same time, and the compounds of general formula (I), general formula (II-B2), general formula (II-B3) and general formula (III-A) are included. It is more preferable to contain them at the same time. --B2), it is more preferable to contain the compounds of general formula (II-B4) and the general formula (III-A) at the same time.

  The liquid crystal composition of the present invention preferably contains the compounds of formula (I-A4), formula (I-B5) and general formula (II) at the same time. In this case, the compounds of formula (I-A4), formula (I -B5), a compound represented by general formula (II) and a compound represented by general formula (III-A) are more preferably contained at the same time. Formula (I-A4), formula (I-B5), general formula (II), general formula It is particularly preferred to contain (III-A) and the compound of general formula (V) simultaneously.

  The liquid crystal composition of the present invention has a dielectric anisotropy (Δε) at 25 ° C. of −2.0 to −8.0, preferably −2.0 to −6.0, and −2.0 to -5.0 is more preferable, and -2.5 to -4.0 is particularly preferable.

  The liquid crystal composition of the present invention has a refractive index anisotropy (Δn) at 20 ° C. of 0.08 to 0.14, more preferably 0.09 to 0.13, and 0.09 to 0.12. Particularly preferred. More specifically, it is preferably 0.10 to 0.13 when dealing with a thin cell gap, and preferably 0.08 to 0.10 when dealing with a thick cell gap.

  The liquid crystal composition of the present invention has a viscosity (η) at 20 ° C. of 10 to 30 mPa · s, more preferably 10 to 25 mPa · s, and particularly preferably 10 to 22 mPa · s.

The liquid crystal composition of the present invention has a rotational viscosity (γ ₁ ) at 20 ° C. of 60 to 130 mPa · s, more preferably 60 to 110 mPa · s, and particularly preferably 60 to 100 mPa · s. .

The liquid crystal composition of the present invention has a nematic phase-isotropic liquid phase transition temperature (T _ni ) of 60 ° C to 120 ° C, more preferably 70 ° C to 100 ° C, and particularly preferably 70 ° C to 85 ° C.

  The liquid crystal composition of the present invention may contain a normal nematic liquid crystal, a smectic liquid crystal, a cholesteric liquid crystal, an antioxidant, an ultraviolet absorber, a polymerizable monomer and the like in addition to the above-described compounds.

  For example, the polymerizable monomer preferably contains 0.01% to 2% by mass of a polymerizable compound such as a biphenyl derivative or a terphenyl derivative. More specifically, the liquid crystal composition of the present invention has the general formula (IV).

It is preferable to contain 1 type, or 2 or more types of the polymerizable compound represented by these.

In the formula, R ⁷ and R ⁸ are each independently the formulas (R-1) to (R-15).

X ¹ to X ⁸ each independently represents a trifluoromethyl group, a trifluoromethoxy group, a fluorine atom or a hydrogen atom.

  The structure of the biphenyl skeleton in the general formula (IV) is more preferably the formula (IV-11) to the formula (IV-14), and particularly preferably the formula (IV-11).

  The polymerizable compound containing a skeleton represented by the formulas (IV-11) to (IV-14) has an optimum alignment regulating force after polymerization, and a good alignment state is obtained.

The polymerizable compound-containing liquid crystal composition of the present invention containing the general formula (IV) which is a polymerizable compound has a low viscosity (η), a low rotational viscosity (γ ₁ ), and a large elastic constant (K ₃₃ ). Therefore, a PSA mode or PSVA mode liquid crystal display element using this can realize a high-speed response.

  The liquid crystal display device using the liquid crystal composition of the present invention has a remarkable feature of high-speed response, and is particularly useful for a liquid crystal display device for active matrix driving, and includes VA mode, PSVA mode, PSA mode, IPS. Applicable for mode or ECB mode.

EXAMPLES The present invention will be described in further detail with reference to examples below, but the present invention is not limited to these examples. Further, “%” in the compositions of the following Examples and Comparative Examples means “% by mass”.
The following abbreviations are used for the description of compounds in the examples.
(Side chain)
-n -C _n H _{2n + 1} linear alkyl group with n carbon atoms
n- C _n H _{2n + 1-} linear alkyl group with n carbon atoms
-On -OC _n H _{2n + 1} linear alkoxyl group with n carbon atoms
nO- C _n H _{2n + 1} O- Linear alkoxyl group with n carbon atoms
-V -CH = CH ₂
V- CH ₂ = CH-
-V1 -CH = CH-CH ₃
1V- CH ₃ -CH = CH-
-2V -CH ₂ -CH ₂ -CH = CH ₃
V2- CH ₃ = CH-CH ₂ -CH _2-
-2V1 -CH ₂ -CH ₂ -CH = CH-CH ₃
1V2- CH ₃ -CH = CH-CH ₂ -CH ₂
(Ring structure)

  In the examples, the measured characteristics are as follows.

T _ni : Nematic phase-isotropic liquid phase transition temperature (° C.)
Δn: refractive index anisotropy at 20 ° C. Δε: dielectric anisotropy at 25 ° C. η: viscosity at 20 ° C. (mPa · s)
γ ₁ : rotational viscosity at 20 ° C. (mPa · s)
K ₃₃ : Elastic constant at 20 ° C. K ₃₃ (pN)
(Comparative Example 1, Example 1, Example 2, Example 3 and Example 4)
LC-A (Comparative Example 1), LC-1 (Example 1), LC-2 (Example 2), LC-3 (Example 3) and LC-4 (Example 4) liquid crystal compositions were prepared. The physical property values were measured. The composition of the liquid crystal composition and the results of its physical properties are shown in Table 1.

The liquid crystal compositions LC-1, LC-2, LC-3 and LC-4 of the present invention have a small viscosity (η), a small rotational viscosity (γ ₁ ), a large elastic constant (K ₃₃ ), and a γ ₁ / _{K 33} is 6.7,6.1,6.0 and 6.0, respectively, it was significantly smaller than that of the LC-a as a comparative example. When the response speed of the liquid crystal display element using these was measured, LC-1, LC-2, LC-3, and LC-4 are sufficiently high-speed responses, and about 10% to 20% than LC-A. It was fast. Furthermore, when the voltage holding ratio (VHR) was measured, it was confirmed that it had high VHR. The cell thickness is 3.5 μm, the alignment film is JALS2096, the response speed measurement conditions are Von 5.5 V, Voff 1.0 V, measurement temperature 20 ° C., and AUTRONIC-MELCHERS DMS301 is used. It was. VHR measurement conditions were a voltage of 5 V, a frequency of 60 Hz, and a temperature of 60 ° C., and VHR-1 manufactured by Toyo Technica Co., Ltd. was used.
(Comparative Example 2, Example 5, Example 6 and Example 7)
LC-B (Comparative Example 2), LC-5 (Example 5), LC-6 (Example 6) and LC-7 (Example 7) liquid crystal compositions were prepared and their physical properties were measured. The composition of the liquid crystal composition and the results of its physical properties are shown in Table 2.

The liquid crystal compositions LC-5, LC-6 and LC-7 of the present invention have a small viscosity (η), a small rotational viscosity (γ ₁ ), a large elastic constant (K ₃₃ ), and a γ ₁ / K ₃₃ of The values were 7.3, 6.9, and 7.0, respectively, which were significantly smaller than those of the comparative example LC-B. When the response speed of the liquid crystal display element using these was measured, LC-5, LC-6, and LC-7 were sufficiently high-speed responses, and were 10% or more faster than LC-B. Furthermore, when the voltage holding ratio (VHR) was measured, it was confirmed that it had high VHR. The cell thickness is 3.5 μm, the alignment film is JALS2096, the response speed measurement conditions are Von 5.5 V, Voff 1.0 V, measurement temperature 20 ° C., and AUTRONIC-MELCHERS DMS301 is used. It was. VHR measurement conditions were a voltage of 5 V, a frequency of 60 Hz, and a temperature of 60 ° C., and VHR-1 manufactured by Toyo Technica Co., Ltd. was used.

From the above, the liquid crystal composition of the present invention has a sufficiently small viscosity (η) without lowering the refractive index anisotropy (Δn) and the nematic phase-isotropic liquid phase transition temperature (T _ni ). VA-type liquid crystal display element using a negative viscosity anisotropy (Δε) having a sufficiently small rotational viscosity (γ ₁ ), a large elastic constant (K ₃₃ ), and a large absolute value Was confirmed to have excellent display quality and quick response speed.
(Comparative Example 3, Example 8, Example 9 and Example 10)
LC-C (Comparative Example 3), LC-8 (Example 8), LC-9 (Example 9) and LC-10 (Example 10) liquid crystal compositions were prepared and their physical properties were measured. The composition of the liquid crystal composition and the results of its physical property values are shown in Table 3.

The liquid crystal compositions LC-8, LC-9 and LC-10 of the present invention have a small viscosity (η), a small rotational viscosity (γ ₁ ), a large elastic constant (K ₃₃ ), and a γ ₁ / K ₃₃ of The values were 6.1, 6.6, and 6.4, respectively, which were significantly smaller than those of LC-C as Comparative Example 3. When the response speed of the liquid crystal display element using these was measured, LC-8, LC-9, and LC-10 were sufficiently high-speed responses, and were about 20% to 30% faster than LC-C. . Furthermore, the voltage holding ratio (VHR) was measured and confirmed to have a high VHR. The cell thickness is 3.5 μm, the alignment film is JALS2096, the response speed measurement conditions are Von 5.5 V, Voff 1.0 V, measurement temperature 20 ° C., and AUTRONIC-MELCHERS DMS301 is used. It was. VHR measurement conditions were a voltage of 5 V, a frequency of 60 Hz, and a temperature of 60 ° C., and VHR-1 manufactured by Toyo Technica Co., Ltd. was used.

From the above, the liquid crystal composition of the present invention has a sufficiently small viscosity (η) without lowering the refractive index anisotropy (Δn) and the nematic phase-isotropic liquid phase transition temperature (T _ni ). VA-type liquid crystal display element using a negative viscosity anisotropy (Δε) having a sufficiently small rotational viscosity (γ ₁ ), a large elastic constant (K ₃₃ ), and a large absolute value Was confirmed to have excellent display quality and quick response speed.

Claims (14)

As the first component, the general formula (I)

(In the formula, q represents 0 or 1, R ⁵⁵ represents an alkenyl group having 2 to 10 carbon atoms) and contains one or more compounds represented by 3 to 25% by weight, and the second component is represented by the general formula (II)

Wherein R ¹ and R ² are each independently an alkyl group having 1 to 10 carbon atoms, an alkoxyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, or 2 carbon atoms. represents 10 alkenyloxy group, ^{R 1} and ^R present in the ² one -CH ₂ - or nonadjacent two or more -CH ₂ - are each independently -O- and / or -S And one or more hydrogen atoms present in R ¹ and R ² may be each independently substituted with a fluorine atom or a chlorine atom, and ring A is trans- 1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group 2,3-difluoro-1,4- Phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2 , 6-diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, ring B is 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro group -1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, 2,3-difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2 2.2] Octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydronaphthalene-2, 6-jii P represents 0, 1 or 2. Z represents a single bond.) A liquid crystal composition comprising one or more compounds selected from the group of compounds represented by: . The dielectric anisotropy (Δε) at 25 ° C. is in the range of −2.0 to −8.0, the refractive index anisotropy (Δn) at 20 ° C. is in the range of 0.08 to 0.14, The viscosity (η) at 20 ° C. is in the range of 10 to 30 mPa · s, the rotational viscosity at 20 ° C. (γ1) is in the range of 60 to 130 mPa · s, and the nematic phase-isotropic liquid phase transition temperature (T _ni 2) is in the range of 60 ° C. to 120 ° C. 2. The liquid crystal composition according to claim 1 or 2, wherein the content of the second component is 10 to 90% by mass. As the second component, general formula (II) is general formula (II-B2), general formula (II-B4) or general formula (II-B5).

(In the formula, R ³ and R ⁴ each independently represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and one or two present in R ³ and R ⁴ ) The liquid crystal composition according to any one of claims 1 to 3, wherein at least one hydrogen atom may be independently substituted with a fluorine atom. General formula (I) is formula (I-A4), formula (I-B4) or formula (I-B5)

The liquid crystal composition according to claim 1, wherein the liquid crystal composition is a compound represented by the formula: As the third component, from general formula (III-A) to general formula (III-J)

(Wherein R ⁵ is an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, R ⁶ is an alkyl group having 1 to 5 carbon atoms, and an alkoxyl having 1 to 5 carbon atoms. Group, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms, provided that the compound represented by the general formula (III-F) is represented by the general formula (I) The liquid crystal composition according to any one of claims 1 to 5, comprising one or more compounds selected from the group of compounds represented by the following formula: The liquid crystal composition according to claim 6, which contains the general formula (I), the general formula (II-B2), and the general formula (III-A) at the same time. The liquid crystal composition according to claim 6, which contains the general formula (I), the general formula (II-B4), and the general formula (III-A) at the same time. The liquid crystal composition according to claim 6, comprising the general formula (I), the general formula (II-B2), the general formula (II-B4) and the general formula (III-A) simultaneously. The liquid crystal composition according to any one of claims 1 to 9 , comprising one or more polymerizable compounds. The polymerizable compound is represented by the general formula (IV)

(Wherein R ⁷ and R ⁸ are each independently formula (R-1) to formula (R-15)

X ¹ to X ⁸ each independently represents a trifluoromethyl group, a trifluoromethoxy group, a fluorine atom or a hydrogen atom. The liquid crystal composition according to claim 10 . The liquid crystal display element using the liquid-crystal composition of any one of Claim 1 to 11 . Active matrix driving liquid crystal display device using the liquid crystal composition according to any one of claims 1 to 11. VA mode using the liquid crystal composition according to any one of claims 1 to 11, PSA mode, PSVA mode, IPS mode or ECB mode liquid crystal display device.